markocosic Posted September 30, 2022 Share Posted September 30, 2022 Hot water recirculation is nice but (can be) wasteful. You could recirculate only when there is presence detected. That's nice. Any tried tested and recommended presence sensors for (a) whole bathroom or (b) right next to kitchen sink? You could recirculate right back to the cold feed to the tank. You could also backfeed the cold water line near the fixture back towards the tank. See the last bit of this YouTube. Is that legal under UK regs? @Nickfromwales? It look neat to avoid an unnecessary return line; at the expense of your cold water being lukewarm afterwards. This also worth a read: https://www.garykleinassociates.com/PDFs/15 - Efficient Hot-Water Piping-JLC.pdf Link to comment Share on other sites More sharing options...
PeterW Posted October 1, 2022 Share Posted October 1, 2022 12 hours ago, markocosic said: You could also backfeed the cold water line near the fixture back towards the tank. See the last bit of this YouTube. Is that legal under UK regs? @Nickfromwales? It look neat to avoid an unnecessary return line; at the expense of your cold water being lukewarm afterwards No no no no !!!!! That’s not legal and you are not allowed to push water back into the cold feed..!!!! That’s proper dumb American plumbing .. Link to comment Share on other sites More sharing options...
Iceverge Posted October 1, 2022 Share Posted October 1, 2022 What distances are your taps from the UVC? We have a 10mm Hep20 to the kitchen tap fed from a manifold preheated by convection. The pipe length is 13m from memory. Time to hot is 8-9 seconds and flow rate is 5l/min. About 2-3 seconds of this delay is the tap itself and the monobloc looses about 1l/min flow rate too. If you can position your UVC near the kitchen tap and toilet basins a circulation loop is unneeded IMO. Link to comment Share on other sites More sharing options...
markocosic Posted October 1, 2022 Author Share Posted October 1, 2022 Nothing specific in mind - it just seemed such a simple solution to existing setups that there must be a catch. Cooler water would recirculate back towards the unvented cylinder/expansion vessel before being sucked back towards the fixture to blend with the hot. What's the UK logic for prohibiting it? Risk is...? Link to comment Share on other sites More sharing options...
Conor Posted October 2, 2022 Share Posted October 2, 2022 (edited) I second the 10mm pipes. Less than 10seconds for hot water. I also fully insulated the got water pipe to the main kitchen tap. So if your in the kitchen and constantly using hot wat on and off, you don't need flush out all the water in the pipe as it stays warm for a good 15mins. Edited October 2, 2022 by Conor Link to comment Share on other sites More sharing options...
mjsx Posted February 28, 2023 Share Posted February 28, 2023 On 30/09/2022 at 23:47, markocosic said: Any tried tested and recommended presence sensors for (a) whole bathroom or (b) right next to kitchen sink? Seems like a Grundfos pump is the way to go but I can't figure out if/how to trigger via a relay or other external controller. Is that possible? Link to comment Share on other sites More sharing options...
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